Thursday, August17, 2017 L-36.com


Marine Weather and Tides
St. Augustine, FL

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:53AMSunset 8:05PM Thursday August 17, 2017 1:26 PM EDT (17:26 UTC) Moonrise 1:33AMMoonset 3:37PM Illumination 21% Phase: Waning Crescent; Moon at 25 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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AMZ454 Coastal Waters From Altamaha Sound To Fernandina Beach Fl Out 20 Nm- Coastal Waters From Fernandina Beach To St. Augustine Fl Out 20 Nm- Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 959 Am Edt Thu Aug 17 2017
Rest of today..West winds 5 to 10 knots becoming south 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Dominant period 7 seconds. Inland waters a light chop. A chance of showers and Thunderstorms.
Tonight..Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 4 seconds. Inland waters a light chop. A chance of showers and Thunderstorms late in the evening, then a slight chance of showers and Thunderstorms after midnight.
Friday..Southwest winds 5 to 10 knots becoming south 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Dominant period 8 seconds. Inland waters a light chop. A chance of showers and Thunderstorms.
Friday night..Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 4 seconds. Inland waters a light chop. A chance of showers and Thunderstorms through the night.
Saturday..South winds 10 to 15 knots. Seas 2 to 4 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
Saturday night..South winds 10 to 15 knots. Seas 2 to 4 feet. Inland waters a moderate chop. A chance of showers and Thunderstorms.
Sunday..South southeast winds 5 to 10 knots. Seas 2 to 3 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
Sunday night..South southeast winds 5 to 10 knots. Seas 2 to 3 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
Monday..Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 959 Am Edt Thu Aug 17 2017
Synopsis.. Offshore flow will prevail between low pressure north of the waters and high pressure across south florida. Winds will become onshore in the afternoon with the east coast sea breeze. High pressure will build northward and extend over the local waters early next week.

7 Day Forecast for Marine Location Near St. Augustine, FL
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location: 29.88, -81.31     debug


Area Discussion for - Jacksonville, FL
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Fxus62 kjax 171329
afdjax
area forecast discussion
national weather service jacksonville fl
929 am edt Thu aug 17 2017

Heat index values near 105 today with heavy rainfall in
storms...

Update A very saturated airmass was across the local forecast area
with the 12z jax RAOB measuring 2.28" of precipitable water content.

A few early morning showers near the jax metro area and a lone storm
near st. Augustine dissipated shortly after 9 am, yielding just some
debris clouds with mostly sunny to partly cloudy skies across much
of the local forecast area with very muggy conditions as dew pts
ranged in the mid upper 70s.

The two main weather stories today will be (1) heat and high heat
index values nearing 105 deg this afternoon and (2) the potential
for locally heavy, flooding rainfall due to a lot of moisture and
slow and erratic storm motion.

Heat: mid and upper level high pressure across the fl panhandle
and SW ga will slowly retrograde and weaken today while
maintaining a ridge axis across SE ga through tonight. The
stronger subsidence will bring lower convective development and
favor the hottest temps across inland SE ga where mid 90s are
likely by mid to late afternoon, and persisting into the early
evening hours.

Rainfall: farther south across NE fl, the influence of mid upper
level ridging was weaker, with a weak low level trough axis
extending southward from a broad low pressure center near sc along
the local coastline. The combination of a weak pressure pattern
will create very light steering flow across the local area, and
combined with the high atmospheric moisture content and diurnal
heating, above normal sea breeze and outflow induced rain chances
will continue to be advertised today. As the day progresses, the
weak trough axis near the atlantic coast will be drawn inland as
the typical thermal low forms. This trough combined with the
atlantic coast sea breeze and st johns river breeze will bring
scattered midday showers isolated tstorms to areas generally east
of highway 301. Farther west, low level westerly flow will push
convection already firing across apalachee bay early this morning
farther inland along the gulf coast sea breeze through early
afternoon. As the convective temp of 91 is reached, airmass showers
and tstorms will begin to pop across inland areas as well.

As convection grows deeper and sea breezes and outflow boundaries
begin to converge toward each other through the late afternoon
generally between i-75 and highway 301, storm motion will remain
light and thus storm development and propagation erratic. The
sfc-6 km mean steering flow from the jax RAOB this morning was 3
kt. Thus, expect very heavy, locally flooding rainfall into the
afternoon hours with the potential for wet downburst winds of
30-60 mph in the stronger and deeper storms.

Convection will linger into the evening hours while gradually
decreasing and dissipating with the loss of daytime heating.

Aviation PrevailingVFR until convection develops this
afternoon when restrictions are expected to due ts.

Marine Ssw winds 10 kts or less this morning will back SE near
the coast with the sea breeze this afternoon and near 10-15 kts.

Combined seas of 3 ft or less.

Rip currents: low risk.

Preliminary point temps pops
Amg 95 76 94 75 40 20 30 20
ssi 91 79 90 77 40 20 40 40
jax 94 76 92 75 60 30 60 20
sgj 92 77 90 75 50 20 50 20
gnv 92 75 91 73 60 20 60 20
ocf 92 75 91 74 60 20 50 10

Jax watches warnings advisories
Fl... None.

Ga... None.

Am... None.

Enyedi cordero corless


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAUF1 - St. Augustine, FL 3 mi27 min ESE 9.9 G 9.9 85°F 81°F1018.4 hPa (-0.7)80°F
RCYF1 14 mi39 min 91°F
41117 15 mi65 min 84°F1 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 16 mi102 min NW 2.9 90°F 1020 hPa78°F
BKBF1 30 mi39 min SSW 1 G 6 89°F 88°F
LTJF1 35 mi39 min 90°F 76°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 36 mi39 min NE 5.1 G 7 89°F 86°F1018.2 hPa
JXUF1 36 mi39 min 88°F
BLIF1 37 mi39 min W 8 G 12 92°F 1018.8 hPa78°F
DMSF1 37 mi39 min 87°F
NFDF1 40 mi39 min NNE 2.9 G 7 88°F 1018.6 hPa76°F

Wind History for I-295 Bridge, St Johns River, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Northeast Florida Regional Airport, FL6 mi31 minNE 7 G 157.00 miThunderstorm83°F73°F74%1018.4 hPa

Wind History from SGJ (wind in knots)
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Last 24hrW64SE10S15S7S7S7S5SW4SW3SW5SW6W5SW5SW5SW4SW4SW5SW3W6W4W73NE7
G15
1 day ago6SW12
G17
SW7W6W7W6SW7W7W5SW5SW4SW6SW3SW4SW4W5W5W4W5W6NW8NW85Calm
2 days agoW9W7S5S5S4S5CalmCalmCalmCalmSW3SW4SW3SW4SW4SW4SW3CalmSW4W6W7NW8
G16
NW8NW8

Tide / Current Tables for State Road 312, Matanzas River, Florida
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State Road 312
Click for Map
Thu -- 02:33 AM EDT     Moonrise
Thu -- 05:12 AM EDT     4.11 feet High Tide
Thu -- 06:54 AM EDT     Sunrise
Thu -- 11:17 AM EDT     -0.31 feet Low Tide
Thu -- 04:36 PM EDT     Moonset
Thu -- 05:56 PM EDT     5.10 feet High Tide
Thu -- 08:03 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.32.233.74.13.93.22.21.10.2-0.3-0.10.71.93.14.14.85.14.73.92.81.70.7

Tide / Current Tables for Crescent Beach, Matanzas River, Florida
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Crescent Beach
Click for Map
Thu -- 12:04 AM EDT     0.67 feet Low Tide
Thu -- 02:33 AM EDT     Moonrise
Thu -- 05:46 AM EDT     4.22 feet High Tide
Thu -- 06:54 AM EDT     Sunrise
Thu -- 12:12 PM EDT     0.13 feet Low Tide
Thu -- 04:35 PM EDT     Moonset
Thu -- 06:29 PM EDT     5.13 feet High Tide
Thu -- 08:03 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.711.92.83.54.14.23.82.921.30.60.20.41.42.63.74.55.154.43.62.81.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Jacksonville, FL (13,3,4,5)
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Ground Weather Radar Station Jacksonville, FL
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weather_mapweather_map weather_map

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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.